/**
 * 阿拉伯数字转换为简写汉字
 *
 * @export
 * @param {number} num
 * @returns {string}
 */
export function toSimplifiedChinese(num: number): string {
  if (isNaN(num)) return "";
  //字符处理完毕后开始转换，采用前后两部分分别转换
  let part: string[] = String(num).split(".");
  let newchar: string = "";
  //小数点前进行转化
  for (let i = part[0].length - 1; i >= 0; i--) {
    if (part[0].length > 10) {
      //位数过大，无法计算
      return "";
    }//若数量超过拾亿单位，提示
    let tmpnewchar = ""
    let perchar: string = part[0].charAt(i);
    switch (perchar) {
      case "0": tmpnewchar = "零" + tmpnewchar; break;
      case "1": tmpnewchar = "一" + tmpnewchar; break;
      case "2": tmpnewchar = "二" + tmpnewchar; break;
      case "3": tmpnewchar = "三" + tmpnewchar; break;
      case "4": tmpnewchar = "四" + tmpnewchar; break;
      case "5": tmpnewchar = "五" + tmpnewchar; break;
      case "6": tmpnewchar = "六" + tmpnewchar; break;
      case "7": tmpnewchar = "七" + tmpnewchar; break;
      case "8": tmpnewchar = "八" + tmpnewchar; break;
      case "9": tmpnewchar = "九" + tmpnewchar; break;
    }
    switch (part[0].length - i - 1) {
      case 0: tmpnewchar = tmpnewchar; break;
      case 1: if (perchar !== "0") tmpnewchar = tmpnewchar + "十"; break;
      case 2: if (perchar !== "0") tmpnewchar = tmpnewchar + "百"; break;
      case 3: if (perchar !== "0") tmpnewchar = tmpnewchar + "千"; break;
      case 4: tmpnewchar = tmpnewchar + "万"; break;
      case 5: if (perchar !== "0") tmpnewchar = tmpnewchar + "十"; break;
      case 6: if (perchar !== "0") tmpnewchar = tmpnewchar + "百"; break;
      case 7: if (perchar !== "0") tmpnewchar = tmpnewchar + "千"; break;
      case 8: tmpnewchar = tmpnewchar + "亿"; break;
      case 9: tmpnewchar = tmpnewchar + "十"; break;
    }
    newchar = tmpnewchar + newchar;
  }
  //替换所有无用汉字，直到没有此类无用的数字为止
  while (newchar.search("零零") != -1 || newchar.search("零亿") != -1 || newchar.search("亿万") != -1 || newchar.search("零万") != -1) {
    newchar = newchar.replace("零亿", "亿");
    newchar = newchar.replace("亿万", "亿");
    newchar = newchar.replace("零万", "万");
    newchar = newchar.replace("零零", "零");
  }
  //替换以“一十”开头的，为“十”
  if (newchar.indexOf("一十") == 0) {
    newchar = newchar.substr(1);
  }
  //替换以“零”结尾的，为“”
  if (newchar.lastIndexOf("零") == newchar.length - 1) {
    newchar = newchar.substr(0, newchar.length - 1);
  }
  return newchar;
}